Ventilator



Jan. 26, 1960 G. c. BREIDERT ETAL 2,922,354

- VENTILATOR Original Filed Nov. 29, 1954 050 965 BEE/05,97,

IN VENTORS.

GEO/Q65 1M. Bee/0527;

A 7- roe/vsys United States Patent VENTILATOR 1958. Divided and this application December 16, 1957, Serial No. 703,014

1 Claim. or. 98-80) This invention relates to improvements in ventilators of the type to be mounted atop a building or the like in communication with an air outlet vent or conduit, for the purpose of exhausting air from the building, and is a division of my co-pending application Serial No. 471,641, filed November 29, 1954, and now Patent Number 2,830,527 dated April 15, 1958 allowed on October 25, 1957.

It is an object to provide a ventilator in which baflle elements are so arranged and combined as to result in extraneous air currents being so directed with respect to the ventilator as to induce exhaustion of air from the building and to prevent air turbulences from occurring in the ventilator which might cause back pressure to reduce the efficiency of the device. The invention of my said co-pending application accomplishes those as well as other objects however, and the novelty and the advantages of the present improvements reside particularly in the construction and arrangement of the baffle elements which provide added advantages and durability.

While we shall point out in the appended claims the features which we believe to be new, for the purpose of describing how those skilled in the art may make and use our improvements, we shall now describe in detail a presently preferred embodiment thereof, for which purpose we shall refer to the accompanying drawing wherein:

Fig. 1 is a side elev'ational view of aventilator device embodying our invention;

Fig. 2 is an enlarged, fragmentary, vertical medial sectional view; and,

Fig. 3 is a top plan view with lines partly broken away for illustrative purposes.

Referring now to the drawings, the numeral 5 denotes a base having a cylindrical bottom portion 5a of relatively large diameter adapted. to fit over a building outlet flue or vent conduit, not shown. The base then tapers at 5b to a relatively smaller diameter cylindrical inlet neck portion 50 which terminates at its top end in an upwardly and outwardly disposed annular flange portion 5d.

Mounted on the base, we provide a spiralled bafile member generally denoted by the numeral 7, and a cover member 8.

We have shown the spiralled bafile member as comprising two complete whorls, although it should be understood that it may be extended to include any desired number of whorls.

Each of the whorls of the baflle' member comprises, when considered in cross section, a flat, substantially horizontal outer marginal portion 15, an inwardly and upwardly inclined adjoining, or intermediate, portion 16,

and an upwardly and outwardly, or return, inner marginal portion 17; said whorls together defining a vertical air passageway 20 of gradually upwardly increasing diameter since the inside diameter of the upper whorl is greater than that of the lower whorl and the inside diameter of the lower whorl is greater than that of the neck 50. The purpose of the gradually upwardly increasing diameter of the passageway 20 is so that the upwardly moving air- 2,922,354 Patented Jan. V26, 1950 stream may expand in normal manner as it moves upwardly. As shown, the vertical air passageway 20 is coaxial and communicates with the neck.

Also, as will be noted from Fig. 2, the inner marginal portion 17 of the lower whorl terminates above the plane of the outer marginal portion 15 of the upper whorl, while the inner marginal portion 17 of the upper whorl terminates above the plane of the horizontal outer marginal portion of the cover member to be described.

Cover member 8 comprises a flat, horizontal outer marginal portion 25, an inwardly and upwardly inclined adjoining portion 26 and a flat medial or central portion 27 overlying the top end of the air passageway 20.

The outside diameter of the upper whorl of the baflle member is greater than that of the lower whorl and the outsidfe diameter of the cover member is greater than that of the top whorl of the bafile member, which tends to prevent downwardly moving extraneous air currents from creating air turbulences at the peripheral portions of the whorls of the bafile member. The bafile member 7 and cover member 8 are supported from the base by means of circumferentially spaced supporting strips 30 each of which has a bottom end portion 30a secured,

as by welding, to the neck, and has longitudinally spaced somewhat V-shaped portions 30b engaging and conforming to the intersecting portions 16, 17 of the whorls of the baffie member. Said portions of the baflle member may be welded to the portions 3% of the supporting strips, although we do not find this essential. The strips 30 terminate at their top ends in right angularly disposed portions 30c to which the central portion 27 of the cover member is secured by screws and thumb nuts 35.

The cover member and the whorls of the baflle member form transverse and radial air passageways 40, and horizontally moving extraneous air currents are directed around the vertical air passageway 20 without moving over the inner marginal portions 17 of the whorls of the bafiie member to create turbulences and downdrafts. Thus, the whorls of the baffie member function as air foils to create a reduced pressure area immediately around the vertical air passageway 20 to induce air moving along said air passageway 20, outwardly; and the marginal portions 15 and 25 further function to direct the air currents outwardly so that they will not blow downwardly onto the roof of a building upon which the device is mounted. Air which is not induced from the passageway 20 at the whorls of the baflle member strikes the flat central portion 27 of the cover member, by which it is directed outwardly between portion 25 of the cover and portion 15 of the top whorls of the baffle member.

By making the baffle member spiralled as described, it is possible to form the entire baffie unit of one unitary piece of metal instead of a number of separate bafiie elements as has heretofore been necessary. Thus the unitary bafile member is more rigid and durable and better able to withstand the strong winds to which it is often exposed. Also, considerable time is saved in assembling the ventilator.

If desired, a power driven air impeller, not shown, may be used in conjunction with the ventilator above described. However, we find that my improved ventilator etliciently exhausts air when used purely as a gravity type ventilator without the use of an air impeller as a booster.

We claim:

A ventilator device comprising an air inlet neck, a cover having a flat horizontal medial portion, a frusto conical annular side wall portion and a flat horizontal annular marginal portion, circumferentially spaced support strips secured at their bottom ends to said neck and secured at their top ends to said cover whereby to support said cover in vertically spaced, coaxial relationship 3 to said neck, and a single thread, spiraled baffie member carried by said strips and comprising whorls increasing in diameter towards said cover and extending from a point below'the plane of "the outlet end of said neck to a point above the plane of said marginal portion'of said cover whereby their inner surfaces define a vertical air passageway which increases in diameter towards and terminates within said cover and whereby their outer surfaces define a spiraled air passageway terminating within said cover; each of said whorls having a flat, radially 5 References Cited'in thefile of this patent UNITED STATES PATENTS Rice Apr. 9, 1850 Kennel Jan. 14, 1879 Kennedy a June 15, 1943 Breidert Apr. 15. 1958 

